There aren't that many intentional racists trying to run over Black kids. Each incident is terrible, but fortunately, they are extremely rare. Unfortunately, there are very many unintentionally racist people buzzing Black people in crosswalks.
White drivers in the US are *seven times* more likely to buzz past a Black pedestrian in the crosswalk than a white pedestrian. Sometimes this goes horribly wrong. Sometimes what looks like one pedestrian, is two pedestrians.
https://www.chicagotribune.com/nation-world/ct-pedestrians-race-20170322-story.html